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Safety functions 67
Safe torque off (STO)
The STO function brings the machine safely into a no-torque state and/or prevents it
from starting accidentally. The STO function in the FSO module activates the drive
STO function, that is, opens the STO circuit in the drive. This prevents the drive from
generating the torque required to rotate the motor. If the motor is running when the
STO function is activated, it coasts to a stop.
You can configure the SBC function to be activated before, at the same time with, or
after the drive STO function. When you use an encoder, you can also configure the
SBC function to be activated at a user-defined speed limit.
This section describes the different versions of the STO function separately without
and with an encoder.
For more information on the STO function in the ACS880/DCS880 drives, see the
corresponding drive
hardware manual.
WARNING
! For the encoderless mode, you have to set parameters
and
so that the motor has enough time to stop from full speed when
modulation is stopped.
Note:
If the SSE is cascaded, STO activation also activates the SSE cascade
indication signal (output). See sections
on page
and
on page
Note
: Always set the parameters related to the STO function to have the correct
monitoring limit hit and fault reaction behavior. An internal monitoring of the FSO
module can trigger the STO function even if you have not defined an external request
signal. These internal monitorings trigger STO:
• SAR0, SAR1 or SSE/SS1 limit hit
• FSO module fail safe state.
Содержание FSO-21
Страница 1: ... OPTIONS FOR ABB DRIVES FSO 21 safety functions module User s manual ...
Страница 4: ......
Страница 16: ...16 Safety instructions ...
Страница 34: ...34 Safety information and considerations ...
Страница 52: ...52 Overview ...
Страница 236: ...236 PROFIsafe ...
Страница 265: ...PROFIsafe 265 2 Select your CPU from the list 3 Install the FENA 21 GSDML file ...
Страница 275: ...PROFIsafe 275 20 In ABB_Drive FB add blocks DPRD_DAT and DPWR_DAT 21 Insert values to blocks ...
Страница 282: ...282 PROFIsafe 5 To read the diagnostic messages select the I O Device Diagnostics tab ...
Страница 286: ...286 PROFIsafe ...
Страница 304: ...304 Installation ...
Страница 400: ...400 Configuration ...
Страница 488: ...488 Verification and validation ...
Страница 506: ...506 Fault tracing ...
Страница 514: ...514 Maintenance ...
Страница 536: ...536 Technical data ...
Страница 538: ...538 Dimension drawings 3AXD50000018513 ...